Why is pluto no longer considered a plant in our solar system

Its size.

its now a dwarf planet due to that fact,

also the fact of how far away it is fro the sun, as its on the outskirts of our galaxy

scientist said it was not considered a planet because it  -has not cleared its neighboring region of other objects.”

answer; /// i believe that the correct answer is (50%);

this protocol provides a detailed procedure for co-immunoprecipitation (co-ip) to identify protein–protein interactions.